Abstract
A detailed description of the Langmuir probe electronics upgrade for TCV (Tokamak à Configuration Variable) is presented. The number of amplifiers and corresponding electronics has been increased from 48 to 120 in order to simultaneously connect all of the 114 Langmuir probes currently mounted in the TCV divertor and main-wall tiles. Another set of 108 amplifiers is ready to be installed in order to connect 80 new probes, built in the frame of the TCV divertor upgrade. Technical details of the amplifier circuitry are discussed as well as improvements over the first generation of amplifiers developed at SPC (formerly CRPP) in 1993/1994 and over the second generation developed in 2012/2013. While the new amplifiers have been operated successfully for over a year, it was found that their silicon power transistors can be damaged during some off-normal plasma events. Possible solutions are discussed.
Highlights
An extensive array of diagnostics is installed on TCV1,2 (Tokamak à Configuration Variable), in order to give the most complete and accurate description possible of the plasma
The main purpose of this paper is to present a newly developed amplifier circuitry to operate single Langmuir probes (LP) on TCV with an arbitrary bias-waveform or in floating potential mode
This paper has presented the electronics upgrade for the wallembedded Langmuir probes on the TCV tokamak
Summary
An extensive array of diagnostics is installed on TCV1,2 (Tokamak à Configuration Variable), in order to give the most complete and accurate description possible of the plasma. Langmuir probes (LP) are one of the most common tools to describe local properties in the boundary region of the plasma.[3–5]. They typically provide measurements of ion saturation current Isat, electron density ne, electron temperature Te, floating potential Vfl, and plasma potential Vpl. In the single probe arrangement (local measurement of the plasma properties), Isat, Vf l, and ion Mach number M can be readily measured with high time response, e.g., 200 kHz or higher. A detailed description of the analysis and interpretation of LPs in different experimental conditions on TCV has recently been presented elsewhere for wall-embedded probes[6] and for the pins of a fast-reciprocating probe.[7]
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